Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation?
Paleoclimate proxy data suggest that the Atlantic Meridional Overturning Circulation (AMOC) was shallower at the Last Glacial Maximum (LGM) than its preindustrial (PI) depth. Previous studies have suggested that this shoaling necessarily accompanies Antarctic sea ice expansion at the LGM. Here the i...
Published in: | Geophysical Research Letters |
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Online Access: | https://escholarship.org/uc/item/3kx1q270 https://escholarship.org/content/qt3kx1q270/qt3kx1q270.pdf https://doi.org/10.1002/2017gl076437 |
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ftcdlib:oai:escholarship.org:ark:/13030/qt3kx1q270 2024-09-15T17:41:21+00:00 Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation? Sun, Shantong Eisenman, Ian Stewart, Andrew L 2413 - 2423 2018-03-16 application/pdf https://escholarship.org/uc/item/3kx1q270 https://escholarship.org/content/qt3kx1q270/qt3kx1q270.pdf https://doi.org/10.1002/2017gl076437 unknown eScholarship, University of California qt3kx1q270 https://escholarship.org/uc/item/3kx1q270 https://escholarship.org/content/qt3kx1q270/qt3kx1q270.pdf doi:10.1002/2017gl076437 public Geophysical Research Letters, vol 45, iss 5 Climate Action Life Below Water Southern Ocean global ocean overturning circulation climate model Last Glacial Maximum Meteorology & Atmospheric Sciences article 2018 ftcdlib https://doi.org/10.1002/2017gl076437 2024-06-28T06:28:19Z Paleoclimate proxy data suggest that the Atlantic Meridional Overturning Circulation (AMOC) was shallower at the Last Glacial Maximum (LGM) than its preindustrial (PI) depth. Previous studies have suggested that this shoaling necessarily accompanies Antarctic sea ice expansion at the LGM. Here the influence of Southern Ocean surface forcing on the AMOC depth is investigated using ocean-only simulations from a state-of-the-art climate model with surface forcing specified from the output of previous coupled PI and LGM simulations. In contrast to previous expectations, we find that applying LGM surface forcing in the Southern Ocean and PI surface forcing elsewhere causes the AMOC to shoal only about half as much as when LGM surface forcing is applied globally. We show that this occurs because diapycnal mixing renders the Southern Ocean overturning circulation more diabatic than previously assumed, which diminishes the influence of Southern Ocean surface buoyancy forcing on the depth of the AMOC. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean University of California: eScholarship Geophysical Research Letters 45 5 2413 2423 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Climate Action Life Below Water Southern Ocean global ocean overturning circulation climate model Last Glacial Maximum Meteorology & Atmospheric Sciences |
spellingShingle |
Climate Action Life Below Water Southern Ocean global ocean overturning circulation climate model Last Glacial Maximum Meteorology & Atmospheric Sciences Sun, Shantong Eisenman, Ian Stewart, Andrew L Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation? |
topic_facet |
Climate Action Life Below Water Southern Ocean global ocean overturning circulation climate model Last Glacial Maximum Meteorology & Atmospheric Sciences |
description |
Paleoclimate proxy data suggest that the Atlantic Meridional Overturning Circulation (AMOC) was shallower at the Last Glacial Maximum (LGM) than its preindustrial (PI) depth. Previous studies have suggested that this shoaling necessarily accompanies Antarctic sea ice expansion at the LGM. Here the influence of Southern Ocean surface forcing on the AMOC depth is investigated using ocean-only simulations from a state-of-the-art climate model with surface forcing specified from the output of previous coupled PI and LGM simulations. In contrast to previous expectations, we find that applying LGM surface forcing in the Southern Ocean and PI surface forcing elsewhere causes the AMOC to shoal only about half as much as when LGM surface forcing is applied globally. We show that this occurs because diapycnal mixing renders the Southern Ocean overturning circulation more diabatic than previously assumed, which diminishes the influence of Southern Ocean surface buoyancy forcing on the depth of the AMOC. |
format |
Article in Journal/Newspaper |
author |
Sun, Shantong Eisenman, Ian Stewart, Andrew L |
author_facet |
Sun, Shantong Eisenman, Ian Stewart, Andrew L |
author_sort |
Sun, Shantong |
title |
Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation? |
title_short |
Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation? |
title_full |
Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation? |
title_fullStr |
Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation? |
title_full_unstemmed |
Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation? |
title_sort |
does southern ocean surface forcing shape the global ocean overturning circulation? |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/3kx1q270 https://escholarship.org/content/qt3kx1q270/qt3kx1q270.pdf https://doi.org/10.1002/2017gl076437 |
op_coverage |
2413 - 2423 |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
Geophysical Research Letters, vol 45, iss 5 |
op_relation |
qt3kx1q270 https://escholarship.org/uc/item/3kx1q270 https://escholarship.org/content/qt3kx1q270/qt3kx1q270.pdf doi:10.1002/2017gl076437 |
op_rights |
public |
op_doi |
https://doi.org/10.1002/2017gl076437 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
5 |
container_start_page |
2413 |
op_container_end_page |
2423 |
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1810487504710664192 |